- Racing Including Track Operations, North Aurora
- Radiotelephone Communications, North Aurora
- Real Estate, North Aurora - Agent, Broker & Companies
- Real Estate Appraiser, North Aurora - Appraisal Services
- Real Estate Appraisers & Consulting Services, North Aurora
- Real Estate Developers, North Aurora
- Real Estate Services, North Aurora
- Recording Instruments Industrial & Scientific, North Aurora
- Recreational Equipment Repair & Service, North Aurora
- Rehabilitation Centers, Products & Services, North Aurora
- Rehabilitation Specialists, North Aurora
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- Religious Organizations, North Aurora
- Repair Services, North Aurora
- Research Services, North Aurora
- Residential, North Aurora
- Residential Apartments, North Aurora
- Residential Care Facilities, North Aurora
- Residential Construction Contractors, North Aurora - General Contractors
- Restaurant & Lounge, Bar, Or Pub, North Aurora
- Restaurants/Food & Dining, North Aurora
- Retirement Communities & Home, Assisted Living & Apartments, North Aurora
- Riding & Rodeo Services, North Aurora
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